Mount Semeru Erupts Sunday Early Morning, Activity Level at Alert

Mount Semeru in East Java erupted again on Sunday (23/11/2025) at 02.51 AM Western Indonesian Time. In the last week, Mount Semeru has erupted 16 times.

Based on eruption information from the Center for Volcanology and Geological Hazard Mitigation (PVMBG) via the MAGMA Indonesia application, the height of the ash column was observed to be approximately None meters above the peak (None meters above sea level).

The visual eruption was not observed. The eruption was recorded on a seismograph with a maximum amplitude of 22 millimeters and a duration of 120 seconds.

(Read: Floods, Natural Disasters That Frequently Hit Indonesia as of September 2025)

According to MAGMA Indonesia's volcano activity report, Mount Semeru's activity level is at Level IV (Alert). Seismicity observations on November 23, 2025, from 18.00-23.59 WIB showed 29 eruption/explosion earthquakes with amplitudes of 10-22 millimeters and earthquake durations of 74-154 seconds.

Subsequently, there was 1 rockfall earthquake with an amplitude of 2 mm and a duration of 60 seconds, and 11 gas emission earthquakes with amplitudes of 2-8 millimeters and durations of 51-123 seconds.

PVMBG advises against any activities in the southeast sector along Besuk Kobokan, as far as 20 kilometers from the peak (eruption center). Beyond this distance, the public is advised not to conduct activities within 500 meters from the riverbanks (river border) along Besuk Kobokan due to the potential for being affected by the expansion of hot clouds and lava flows.

Throughout 2025, MAGMA Indonesia has recorded 7,016 volcanic eruptions across Indonesia. Mount Semeru in East Java has erupted the most with 2,810 times.

(Read: These are the Provinces Most Affected by Floods in Early 2025)